... energy saving 1, the working principle of: hanging drying tunnel using far infrared heating tube heating, the electrical energy ... speed, safe, convenient, environmentally friendly, energy saving. 2, drying oven tunnel main components and price Diameter size: width 1400mm × 1400m × ... units. Material: a, drying tunnel wall galvanized steel, thickness 0.8mm. b, drying tunnel is surrounded by high-quality ...